/**
 *
 * Copyright (c) 2012 NCS Corporation.
 *
 * Author: pankai
 * Created Date: 2012-7-24
 * 
 * version					author					remark
 *		1.0					pankai				
 */
package com.ocgs.base.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

public class MakeCertPic {

	private char mapTable[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
			'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

	public String getCertPic(int width, int height, OutputStream os) {
		if (width <= 0)
			width = 60;
		if (height <= 0)
			height = 20;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		Graphics g = image.getGraphics();

		g.setColor(new Color(0xDCDCDC));
		g.fillRect(0, 0, width, height);

		g.setColor(Color.black);
		g.drawRect(0, 0, width - 1, height - 1);

		String strEnsure = "";

		for (int i = 0; i < 4; ++i) {
			strEnsure += mapTable[(int) (mapTable.length * Math.random())];
		}

		g.setColor(Color.black);
		g.setFont(new Font("Atlantic Inline", Font.PLAIN, 18));
		String str = strEnsure.substring(0, 1);
		g.drawString(str, 8, 17);
		str = strEnsure.substring(1, 2);
		g.drawString(str, 20, 15);
		str = strEnsure.substring(2, 3);
		g.drawString(str, 35, 18);
		str = strEnsure.substring(3, 4);
		g.drawString(str, 45, 15);

		Random rand = new Random();
		for (int i = 0; i < 10; i++) {
			int x = rand.nextInt(width);
			int y = rand.nextInt(height);
			g.drawOval(x, y, 1, 1);
		}

		g.dispose();
		try {
			ImageIO.write(image, "JPEG", os);
		} catch (IOException e) {
			return "";
		}
		return strEnsure;
	}

}
